If this swelling is just below the vent area, it might be from a reproductive infection. Now, please regard that as extremely tentative and in no way a diagnosis. In fact, treating her with an oral antibiotic and having her improve would be more of a "diagnosis". (It's called trial and error or throw stuff at the problem to see if anything helps.) You can try her on an antibiotic and see if it makes a difference.
As far as being bullied, it's common for a sick chicken to be bullied. I have a hen, herself currently being treated for an infection, who goes into an absolute rage when she sees another hen in the throes of wry neck, attacking her without reserve. Humans have nothing over chickens when it comes to persecuting other individuals for differences.
As far as being bullied, it's common for a sick chicken to be bullied. I have a hen, herself currently being treated for an infection, who goes into an absolute rage when she sees another hen in the throes of wry neck, attacking her without reserve. Humans have nothing over chickens when it comes to persecuting other individuals for differences.
So I emailed the local vet and got Baytril and started her on that. As you said, he also thinks it sounds like peritonitis and chances not great but it's worth a shot, thank you for your guidance and support with this, I'll let you know how it goes.
. After how long would there have been an improvement ? Should I be feeding sugar water as she's not eating ? It got better for a couple of days now I'm not so sure. And if she's not going to make it what do I do next ?